   Chapter 16, Problem 8MI

Chapter
Section
Textbook Problem

If you were to hike southeast from Auto Camp on McDonald Creek up Avalanche Creek to the base of Sperry Glacier, how far would you travel, and how much elevation change would you encounter?

To determine

If you were to hike southeast from Auto Camp on McDonald Creek up Avalanche Creek to the base of Sperry Glacier, how far would you travel, and how much elevation change would you encounter?

Explanation

To find the distance travelled:

Given info:

Scale: 1:125000

Contour interval = 100 ft

Assume that the distance on topographic map as 2 inches using a measuring scale.

Since the scale is a ratio (and looks like this 1:100,000), multiply the map units by the number following the colon.

Formula to find actual distance on ground is as follows:

Distance on ground = Map scale×Distance on map

Substitute map scale value as 125000 inches and obtained distance on map as 2 inches.

Distance on ground = 125,000 inches×2inches=250,000 inches

If 1 mile = 63360 inches,

To convert inch to mile, divide 250,000 inches with 63360 inches to obtain the distance in miles.

25000063360=3.945 miles

Therefore, the distance between Auto camp and base of Sperry glacier is 3.9 miles.

To find elevation change:

Auto Camp is at about 3,400 ft. and the base of Sperry Glacier is about 7,000 feet above the sea level

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